William b



WIIMAII gyagnivotn orfnoornisrnn, Yoiul. I

.speaigaofLeeterS ratenrNdI 12,500, dated March 13,*1s55; i

scriptie-n, reference being had tothefaclcomanying drawings to the letters'of refs y `erence markedjthereon, same letters signifylV y hing like` partsin fall "theIdrawings f 1I y *fAndof saiddrawings Figure l is a fper` "Vspective view ofthe lock as applied to a section ofsashlstile @For the sakefof clear!I `nessthelockis shownin the drawing as `applied tothe outside bfthe stile, Ibut it1 is I`evidentfthatinjImost cases its appearance i andconveniencewouldbe promoted by sink- 1` "ingit in flushwithfthe face of the stile. 1` Figs. 2,3, 4 and `Iarfedetails of thevariou`s "partsi` Figs. 6 and? exemplify the action fof? thecurved groove and `curved wedgeon `fthe bolt" andcurvedshank. Fig; 8 lis adia,` exhibitingaplan of the whole `lock "when together!@Inlthis figure the outer case is drawn" in "black lines; the outline ofthe Ibolt in blueythe` primary slide in red;` and the `secondary slide or? tumbler. (shown sepal rate and detached;` infIFig.` 4) is drawn in ""Ifgreen lines,with its projecting angle resting y injI the notch 71,. diagram.

Figa 9* an explanatory "The, nature of my invention `consists in "arranginga `bolt and `movable slide Within rfa case" so` astofimpart a `nearly horizontal v motion tosaid bolt and thus form a neat and Iiiieient sash lock; and also in providing suitable means to prevent any pressure on Athe bolt in the direction of the arrow (Fig. from withdrawing it from its place.

To enable others skilled in the art to `I`make and use my; invention I will proceed 1 to describe its principles and mode of action u by means ofthe Jfabove-described drawings.

I" constructfalbolt of the form shown in the drawings and having a curved shanl` as therein depicted` Ialso construct a slid-I fingpiece calculated tovmove vertically in theshell, box, orcase of thelock, and having a curved groove (or channel formed `1 thereon `by means `of the projections (b) I "and fthe bolt is prevented by the edge of the box "or casing from` moving vertically, whenever C ythe slide (S) `fdescends from the position shown in Fig., 7 tothat exhibited in Fig. 6,

It will then. be evident that, as

the, wedgeelikedprojection will oni the shoulder (13) and eject the bolt. Now iffthe` shank were straight and merely inclined atan angle with the bolt," although it would move perfectly horizontal it `would be necessary either to haveV at very f obtuse angle, or 1va very"` great amount lof motion on the part of the slide toIproduce the desired amount Vofprojection Vof the bolt.` `But the curved shank, operated on by the curved Wedge, imparts" not onlyia horizontal, but an `angular or circular motionto the bolt Iwhereby a i compound movement partaking somewhat ofthe nature of a cycloidis secured. This motion will be very easily un-` derstoodfrom the diagram Fig. 9. lIn this `diagram wemay atrst suppose the bolt to revolve around the pivot (a) when acted `upon by the circular wedge (fw). n In ,this

caseany point (p) in the bolt would describe a `simple arcof a circle. But as the bolt is straight instead" of curved andthe bolt con.-

"strained initsmotion` by the edge of the case, the wholebolt and shank must move vertically through a` distance equal to the difference between the' radii a c and a The ultimate movement of the bolt then is compounded `of Athe `,angular and vertical movements--these two (one being in thedirectionof a straight line and the other of a circle) tending to produce a horizontal cycloidal motion, in which the deviation of the angular, or circular, movement from a purely rectilineal and horizontal one, is rectified by the said vertical movement of the center (a)-that is ofthe whole bolt and shank. By these means I secure not only the nearly horizontal movement of the bolt but also the full amount of throw attainable by giving` it a circular mot-ion, and

we are thus enabled to attain a sufficientpro- 3' jection of the bolt without the necessity for' a wide lock `case or a great vertical movement ofthe slide. All `the parts of the lock also are easily fitted and moved, so that the ease of manipulation is increased and tear and wear `both of the locks and sashes diminished. It is further evident that these motions of the bolt and slide might be produced from the outside of the case, by the simple action of a pin proj ectingv through the slottm), but in this case any action on the bolt would be equally in the slide, and the loc i would be comparatively insecure. To obviate this I connect roductive of motion with the first sliding piece a secondary slide or tumbler (T), which is constructed as shown in detail in Fig. 4. A pin (I) on this slide passes through the slot (m) while a notch (n) which slips on to the projection (e) on the slide (s) enables it to have a slight angular motion of which (e) is the cent-er. (m) is a projection against which the upper edge of the secondary slide or tumbler (T) will bear when a vertical pressure is exerted against the pin (P), and which will enable this pressure to move the slide (S), and consequentlythe bolt (B).

The notch (n) and pin (p) mutually act as pivots to each other, and any force applied to the one will of course tend to rotate the slide about the other. Hence a force applied to the bolt (B) will act on the tumbler (T) through the slide (S), and projection (e) and will consequently tend to bring the projecting angle (g1) of the tumbler (T) into one of the notches (71,) in the case, when all further movement will be ei'ectually pren vented. But a vertical pressure on the pin (p) will produce a rotary movement in a contrary direction, tending to release the tumbler from the notch (71,) and allow it to act freely on the slide (S) through the projection (m). The same result, but in a less perfect. manner, may be obtained without the secondary7 slide or tumble (T) by formn ing a projecting corner on the primary sliding block and recessing the outer case to suit. This modification of the primary sliding block is shown in Fig. 5, and the corresponding modiication required in the case will readily suggest itself to any intelligent mechanic. This method however, though cheaper, is not so perfect in its action, and I vplained.

bler is more @1w-1y exhibited in rig. s

the different parts being there shown in variously colored lines as previously ex- The projecting angle of the tumbler (T) is there shov'vn resting in the notch .(75) which it will do from the force of gravity as Well as from pressure on the bolt (B).

In order to avoid tearing and injuring the casing I allow the secondary slide or tumbler to move quite freely and unobstructedly during the latter part of the movement of the bolt, so as to make up for any slight variations which may occur in the sashframe or casing. But by means of the notches (7a, 7L, 71,) and the action of the tumbler thereon during the first part of the bolt-s motion the action of the stops in the sash against the end of the bolt, when these stops become Worn, or when there is a great amount of play between the sash and the window-casing, is effectually obviated. These notches also increase its security when used as a railroad car lock-preventing the withdrawal of the bolt by any sudden jolt or jar. f

That I claim as my invention and desire to secure by Letters Patent is- The arrangement of the bolt B, traversing in guides; the slide S, and the tumbler T in relation to the case and the notches 7i thereon, as herein set forth.

IVM. E. ARNOLD.

Signed in presence of- WM. BUsHN-ELL, I-I. G. ARNOLD. 

